A boy is selling fish at the local intersection in town...

"Dam fish! Get your dam fish here!", the boy shouts.

A priest walks by, totally confused, so he decides to ask the boy what the problem is.

"Son, why are you calling them 'damn fish"? What did they do to you?"

"I caught these fish at the local dam, so I'm selling them as dam fish!", he replies.

"Oh, now that makes sense!", says the priest. "I'll take two then!"

Later that night the priest gets home, slams the two fish down on the counter and tells his wife to "cook the dam fish".

"I didn't know it was appropriate for a priest to speak like that.", says his wife.

The priest explains to his wife that they were caught at the local damn. "Oh, okay then!", she says, and proceeds to cook the fish for dinner.

Later that night at dinner, the priest, his wife, and son are sitting around the dinner table. The priest says to his son, "Son, pass the dam fish."

Son: "That's the spirit dad! Now pass the fucking potatoes!"